Tools & Wizards About Us

Report Summary

  • 79

    Performance

    Renders faster than
    85% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 44% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

jzcodes.com

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Page Load Speed

7.6 sec in total

First Response

678 ms

Resources Loaded

6.8 sec

Page Rendered

85 ms

About Website

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Key Findings

We analyzed Jzcodes.com page load time and found that the first response time was 678 ms and then it took 6.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

jzcodes.com performance score

79

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

43/100

10%

LCP (Largest Contentful Paint)

Value4.0 s

51/100

25%

SI (Speed Index)

Value4.1 s

79/100

10%

TBT (Total Blocking Time)

Value10 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value4.0 s

87/100

10%

Network Requests Diagram

jzcodes.com

678 ms

www.jzcodes.com

1133 ms

jquery-1.9.1.min.js

421 ms

fastclick.js

619 ms

600.js

1141 ms

Our browser made a total of 22 requests to load all elements on the main page. We found that 82% of them (18 requests) were addressed to the original Jzcodes.com, 9% (2 requests) were made to Tj.0523news.com and 5% (1 request) were made to Jsjsjs.vip. The less responsive or slowest element that took the longest time to load (1.4 sec) relates to the external source Tj.0523news.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 271.4 kB (66%)

Content Size

413.9 kB

After Optimization

142.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jzcodes.com main page is 413.9 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Javascripts take 352.1 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 26.6 kB

  • Original 31.7 kB
  • After minification 23.9 kB
  • After compression 5.1 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 7.8 kB, which is 25% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 26.6 kB or 84% of the original size.

Image Optimization

-34%

Potential reduce by 3.3 kB

  • Original 9.8 kB
  • After minification 6.5 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, Jzcodes needs image optimization as it can save up to 3.3 kB or 34% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-65%

Potential reduce by 230.0 kB

  • Original 352.1 kB
  • After minification 335.8 kB
  • After compression 122.1 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 230.0 kB or 65% of the original size.

CSS Optimization

-57%

Potential reduce by 11.6 kB

  • Original 20.4 kB
  • After minification 11.1 kB
  • After compression 8.8 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Jzcodes.com needs all CSS files to be minified and compressed as it can save up to 11.6 kB or 57% of the original size.

Requests Breakdown

Number of requests can be reduced by 10 (53%)

Requests Now

19

After Optimization

9

  • Images
  • JavaScript
  • CSS

The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jzcodes. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

jzcodes.com accessibility score

77

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Image elements do not have [alt] attributes

Best Practices

jzcodes.com best practices score

50

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

jzcodes.com SEO score

85

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document doesn't use legible font sizes

Language and Encoding

  • Language Detected

    VI

  • Language Claimed

    ZH

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Jzcodes.com can be misinterpreted by Google and other search engines. Our service has detected that Vietnamese is used on the page, and it does not match the claimed Chinese language. Our system also found out that Jzcodes.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph description is not detected on the main page of Jzcodes. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: